It's just a very simply version.
Color even not very correct. I didn't write the price expand or other condition.
It's welcome if other guys want to write a full version.
If this kind chart is not from western.
Then I think it's qianlong platform's indicator. (QianLong means Money Dragon)
If you know the origin of tower line pelease comment to tell me. :3
Previous I'v already writed something about it.
I'v updated the detail in comment. In case you guys might not read it. I'm writing this new article
Draw rule
2bar's range break
U1=close>=close and close>=close ? 1 : 0
D1=close<=close and close<=close ? 1 : 0
Draw them with the color you like.
U1->D1 or d1->u1 1st break. Fill the lower gap under the break to...
